- Move 12 historical/superseded docs + 1 session log + 1 PDF + 1 HTML plan to archive/
- Merge 4 VM-crash docs into archive/vm-crash-incident.md
- Merge LDAP plan + spec into ldap.md
- Merge FilePond race investigation into filepond-crash-analysis.md
- Merge SPECS.md client notes into spec-sheet.md appendix
- Update README index and security.md cross-reference